Even if you work for Megacorp.com, you still pay the full amount of socialist insecurity and mediscare taxes. It all comes out of the pot of money your employer has available to cover payroll.
its not the same thing
In your case you pay half and your employer matches
If you are a sole proprietorship or sole owner of an LLC like me
You pay both halves
Roughly 20,000 year end year out as a self employment tax
Double what a max earner for someone else pays from their pocket